I'm not arguing that the black sites weren't horrible, however thousands of people being kidnapped by the CIA is less than almost a million people kidnapped by China in Xinjiang. And this is only talking about what China has knowingly done indiscriminantly towards innocent civilians, the torture and disapperances of people who have been charged or investigated for crimes against the Chinese state (which is more comparable to how people were put into the black sites) is mind boggling, in some cases just writing a blog post has resulted in torture.
The wars in Libya, Syria and Iraq did see their share of human rights abuses, and yes some of these crimes were denied by the US, but by and large the US worked with the local population as best they could and investigated soldiers for war crimes when there was sufficient evidence which is light years more than what can be said of what the Chinese government has done which is permanently in denial mode.
Not saying the US shouldn't address and improve their own record of human rights abuses, and indeed address those that are currently ongoing (such as the detention of immigrants without a trial), but claiming that they have no business criticizing the ongoing, orders of magnitude larger Chinese human rights abuses is going to make the world a worse place.